How Can I Enforce HTTPS Using a Web.config File on IIS 7.5?

Enforcing HTTPS with Web.config Configuration

Despite extensive online searches, finding a clear solution for implementing HTTPS enforcement using a web.config file can be challenging. While common solutions typically revolve around ASP.NET, this guide focuses on a simplified approach compatible with Windows and IIS 7.5.

To achieve HTTPS enforcement, install the URL Rewrite module, preferably version 2. Once installed, you can utilize the web.config file as follows:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <rewrite>
            <rules>
                <clear/>
                <rule name="Redirect to HTTPS" stopProcessing="true">
                    <match url=".*"/>
                    <conditions>
                        <add input="{HTTPS}" pattern="off" ignoreCase="true"/>
                    </conditions>
                    <action type="Redirect" url="https://{HTTP_HOST}{REQUEST_URI}" redirectType="Permanent" appendQueryString="false"/>
                </rule>
            </rules>
        </rewrite>
    </system.webServer>
</configuration>

This configuration forces HTTPS for all resources using a 301 Permanent Redirect.

Note: This solution operates at a system level, prior to code execution, and is independent of technology like ASP.NET or PHP.

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